linux-kernel - Re: linux-next: rr tree build failure

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Message-Id: <200811241438.36973.rusty@rustcorp.com.au>
Date:	Mon, 24 Nov 2008 14:38:36 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Greg KH <gregkh@...e.de>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-kernel@...r.kernel.org, Pete Zaitcev <zaitcev@...hat.com>
Subject: Re: linux-next: rr tree build failure

On Saturday 22 November 2008 17:11:32 Greg KH wrote:
> On Sat, Nov 22, 2008 at 01:01:06PM +1030, Rusty Russell wrote:
> > Fair enough.  Patch below does this as moduleparam.h suggests.
> >
> > It still means that the paremeter appears in
> > /sys/module/kernel/parameters/nousb OR
> > /sys/module/usbcore/parameters/nousb.
>
> What's the "OR" part?  What determines where it goes?

Whether usbcore is a module or not, of course.

> > +/* To disable USB, kernel command line is 'nousb' not 'usbcore.nousb' */
> > +#undef MODULE_PARAM_PREFIX
> > +#define MODULE_PARAM_PREFIX
> > +module_param(nousb, bool, 0444);
>
> That undef seems hacky beyond belief.

*Exactly*.  And while you're not the first person to do this, you're the one 
one to use it for code which can be a module :(

> How would one know to do this?

The same way Pete found __module_param_call, by reading the header:

 /* You can override this manually, but generally this should match the
    module name. */
 #ifdef MODULE
 #define MODULE_PARAM_PREFIX /* empty */
 #else
 #define MODULE_PARAM_PREFIX KBUILD_MODNAME "."
 #endif

Cheers,
Rusty.
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